Conjugate Heat Transfer Analysis on a graphics card.

AIM: To perform CHT analysis on Graphic card.

PROCEDURE:

Geometry:

Geometry details:

       Processor                                             Fins                                             Base                                              Enclosure

Meshing:

Baseline setup:

Element size = 10.289 mm Number of nodes = 15922, Number of elements = 84873

Fluent setup:

Simulation type: Steady state simulation

Solver: Pressure based , Turbulance model : K-epsilon turbulance model with standard wall functions

Materials: Fins : Aluminimum (solid), Base : Fr-4 (solid), Processor: Silicon (solid), Enclosure: Air (fluid)

RESULTS:

Residuals:

Temperature contour cut plane:

Temperature contour:

Temperature contour processor:

Velocity contour:

Wall heat transfer coeffcient:

Refined setup

We have refined the mesh using body sizing option for different components of graphic card

Default element size = 2mm

Fin body sizing = 0.5mm

Processor body sizing = 0.5mm

Base body sizing = 1mm

Number of Nodes = 61,983 Number of elements = 325,484

We are studying the refined case for 3 different values of inlet velocity

Case-1: Inlet velocity = 1m/s

Residuals

Temperature contour cut plane:

Temperature contour:

Temperature contour processor:

Velocity contour:

Wall heat transfer coeffcient:

Case-2: velocity = 3m/s

Residuals:

Temperature contour cut plane:

 Temperature contour:

Temperature contour processor:

 Velocity contour:

Wall heat transfer coeffcient:

CAse-3: inet velocity = 5m/s

residuals:

Temperature contour cut plane:

 Temperature contour:

Temperature contour processor:

 Velocity contour:

Wall heat transfer coeffcient:

Summary:

Conclusion:

As the mesh is refined from 1st case to 2nd case, the values of temperature and heat transfer coefficient are decreasing with the same velocity.

As the velocity increases, the temperature decreases but the heat transfer coefficient reamains the same.